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INFLUENCE OF THE HISTOCOMPATIBILITY SYSTEM ON REPRODUCTIVE EFFICIENCY OF TURKEYS

The histocompatibility system (h.s.) in chickens, ascribed originally to the B blood group locus (Schierman & Nordskog, 1961) and additionally to the C blood group locus (Schierman & Nordskog, 1965) and the W sex chromosome (Bacon & Craig, 1966; Gilmour, 1967), may be even more complicated since Hála (1968) reported on two inbred lines that differed by as many as ten histocompatibility loci. It is evident that certain combinations of alleles within the B locus are responsible for improved survival and reproductive efficiency and led Nordskog (1964) to state that "the cumulative evidence leads to one rather consistent finding: that B locus polymorphisms have adaptive value." He further pointed out that the advantages of some blood groups may be the result of linkages with other genes influencing fitness and that these would best be studied in